South KoreaTechnology and telecom2025–2026LG CNS
Claude Code-based migration of a 20-year-old project management system for a Korean construction company
LG CNS migrated a 20-year-old system in 7 months at roughly half the cost of a conventional rebuild using Claude Code
Problem
A Korean construction company ran its projects on a 20-year-old project management system that covered work from winning an order through final settlement. LG CNS, the IT services arm of LG Group, had to modernize it. The company said a conventional delivery would have taken at least twice the available time and money.
Approach
LG CNS built an orchestration layer around Claude Code for its Build Factory modernization service. The layer covers legacy analysis, business logic extraction, code generation, testing, verification and quality management. Work was split into small tasks defined in YAML, and Claude was accessed through Amazon Bedrock so it ran inside the client's existing AWS security setup. The project ran from November 2025 to June 2026.
Results
Takeaway
Splitting a migration into small, scoped tasks with validation between stages let one IT services team convert almost all of a legacy system's interfaces in a single project.
Categories
- Size
- Large enterprise
- Industry
- Technology and telecom
- Business function
- IT and R&D
- Innovation type
- Process innovation
- AI technology
- Generative AIAI agents
- Adoption
- Built in-house
- Evidence
- Vendor case study
Sources
Source summaries
Anthropic's customer story describes how LG CNS used Claude Code inside its Build Factory service to migrate a Korean construction company's 20-year-old system. It reports 2,888 of 2,913 APIs converted, a 7-month migration, 1,340 screens moved and a cost of roughly half a conventional rebuild. The page carries no date; the Internet Archive first saved it on July 21, 2026.
Full details are in the original sources.